add optional argument to predict/score functions to avoid covering

[rpreen]

Python xcs.predict() now takes an optional argument that specifies the value to return for a sample that results in an empty match set instead of invoking covering.

Example for y_dim=1

pred = xcs.predict(X_test, cover=[0.5])

---

Same for xcs.score()

Example for y_dim=2

error = xcs.score(X_val, y_val, cover=[0.1, 0.5])

[codecov]

Codecov Report

Merging #59 (5e13973) into master (dcd843f) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
- Coverage   18.83%   18.82%   -0.02%     
==========================================
  Files          62       62              
  Lines        8783     8788       +5     
  Branches     1058     1060       +2     
==========================================
  Hits         1654     1654              
- Misses       7129     7134       +5     

Impacted Files	Coverage Δ
xcsf/clset.c	0.00% <0.00%> (ø)
xcsf/xcs_rl.c	0.00% <0.00%> (ø)
xcsf/xcs_supervised.c	0.00% <0.00%> (ø)

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication